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Gelneren [198K]

3 years ago

10

Rolf spent 15 hours last week practicing his saxophone. If 3/10 of the time was spent practicing warm up routines, how much time

did he spend practicing warm up routines

1 answer:

agasfer [191]3 years ago

4 0

Four point five (4.5)

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What is 18% of 50?<br> _90<br> _50<br> _36<br> _9<br> _18

FrozenT [24]

Answer:

9

Step-by-step explanation:

percentages are reversable. like instead of 18% of 50 you could reverse it and say what is 50% of 18. which is 9.

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Expression in simplest form

SashulF [63]

Answer:

$-x^{3} -9x^{2}$

Step-by-step explanation:

I think.

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2 years ago

If a ray bisects an angle, each newly formed angle measures 90 degrees.

prohojiy [21]

Answer:

A) Sometimes

A ) Sometimes is the correct answer because b) always and c) never is not possible

it cannot be always measured 90 degrees

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3 years ago

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The volume of a box in the shape of a rectangular prism

MakcuM [25]

Answer: 12

Step-by-step explanation:

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3 years ago

Using the Law of Cosines, in triangle DEF, if e=18yd, d=10yd, f=22yd, find measurement of angle D

Ivahew [28]

Check the picture below.

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}=cos(C)\implies cos^{-1}\left(\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}\right)=\measuredangle C\\\\
-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
f=22
\end{cases}\implies cos^{-1}\left(\cfrac{{{ 18}}^2+{{ 22}}^2-10^2}{2(18)(22)}\right)=\measuredangle D$

$\bf \implies cos^{-1}\left(0.893\overline{93}\right)=\measuredangle D\implies 26.63^o\approx \measuredangle D$

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3 years ago